greater than 0? If any of these knobs is set to 0, no signal is routed
to the amp's outputs.
-> Did you send via MIDI foot board a MIDI controller 7 command with
a value less than or equal to 5? This activates Master Volume Mute,
thereby silencing the amp.
You can check this by deactivating the Master Volume Mute by resetting
the appropriate encoding button (55) accordingly.
-> You may be looking at a faulty tube or another defect. In this case,
be sure to take the preamp to an authorized, professional service center.
-> Is the Ground Lift switch (79) set to Ground? If you are operating the
amp without other grounded gear (power amp, effect devices) connected,
this switch must be set to the Ground position; otherwise, it's goodbye silence,
hello humming! In this case, the amp will hum even without a guitar connected.
-> The amp and mains grounds are not connected properly or are altogether
disconnected. Have an experienced specialist check this.
-> Cords connected to the input or effect loops may not be shielded properly.
Replace them to check if this is indeed the case.
-> The amp or speaker cords may be picking up interference from powerful
magnetic fields (for example, of nearby power transformers or electrical motors).
Reposition the amp and connector cables.
-> The amp or speaker cords may be picking up radio signals, for example,
from activated mobile telephones or powerful local transmitting stations nearby.
Switch off mobile phones while troubleshooting noise problems.
-> If you are feeding the signal to recording equipment or a mixing console via
the amp's and the XLR Ground (71) button is set to Pin 1 to Ground,
the problem may be a ground loop that has been formed with the connected
device's ground. Set the button to Ground Lifted.
-> The given power tube is defective and must be replaced if the electronic circuit
breaker continues to trip after several attempts to reset the Tube Monitoring
System by flipping the Standby switch off and back on again.
-> The amp has been overloaded, perhaps by excessive volume levels,
mains over-voltage, or the wrong output impedance (the impedance setting
does not match the connected speaker's impedance).
-> When the amp is loaded with EL 34 tubes, in Lo Power mode, and set to
extremely high volumes, the electronic monitoring system may trip and
shut the power tubes down.
The speaker is emitting humming noises:
The electronic power amp protection circuit has tripped:
Line Out
41
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